Why are fossil fuels considered nonrenewable resources if they are still forming beneath the surface today?
1 answer:
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Answer:
The true statement is:
"(C) The magnitude of the average velocity is equal to 30 m.p.h."
Explanation:
Given that a car travels 30 miles in 1 hour on a winding mountain road.
Let' check all the statements one by one:
(A) The magnitude of the total displacement is larger than the distance traveled.
Since the entire motion of the car is not exactly given in the question, so it is not possible to tell whether the magnitude of the total displacement is larger than the distance traveled or not.
Thus, this statement is not true.
(B) The magnitude of the average velocity is greater than 30 m.p.h.
The average velocity of an object is defined as the total displacement covered by the particle divided by the total time taken in covering that displacement.
Total distance covered by the car = 30 miles.
Total time taken by the car to cover this distance = 1 hour.
Therefore, the average velocity of the car for this time interval =
Thus, this statement is also not true.
(C) The magnitude of the average velocity is equal to 30 m.p.h.
As is cleared in part (B) section above, the average velocity of the car in the given time interval is 30 m.p.h.
Thus, this statement is true.
(D)The magnitude of the average velocity is less than to 30 m.p.h.
Since. the average velocity of the car is 30 m.p.h.
Thus, this statement is not true.
(E)The car traveled with a constant speed of 30 m.p.h.
The motion of the car on the mountain road is not thoroughly given in the question, so again it is not possible to tell whether the car traveled with a constant speed of 30 m.p.h. or not.
Thus, this statement is also not true.
Answer:
44J
Explanation:
Given parameters:
Mass of rock = 0.22kg
Initial velocity = 20m/s
Distance moved = 10m
Unknown:
Initial kinetic energy of the rock = ?
Solution:
To solve this problem, we need to understand that kinetic energy is the energy due to the motion of a body.
It is mathematically expressed as;
Kinetic energy = m v²
m is the mass
v is the velocity
Kinetic energy = x 0.22 x 20² = 44J
Answer:
Height = 53.361 m
Explanation:
There are two balloons being thrown down, one with initial speed (u1) = 0 and the other with initial speed (u2) = 43.12
From the given information we make the following summary
= 0m/s
= t
= 43.12m/s
= (t-2.2)s
The distance by the first balloon is
where
a = 9.8m/s2
Inputting the values
The distance traveled by the second balloon
Inputting the values
simplifying
Substituting D of the first balloon into the D of the second balloon and solving
Now we know the value of t. We input this into the equation of the first balloon the to get height of the apartment